Electrophotography – Image formation – Charging
Reexamination Certificate
2006-09-06
2010-06-08
Gray, David M (Department: 2852)
Electrophotography
Image formation
Charging
Reexamination Certificate
active
07734223
ABSTRACT:
An image forming apparatus and process cartridge employed in same which, when contact charging processing is implemented employing a brush roller, suppresses the generation of localized excessive discharge and suppresses a state of localized excessive discharge on a photosensitive drum surface. Charging means is configured from a brush roller in the surface of which a brush is formed, drive means for rotationally driving the brush roller, and a power source for applying a prescribed charging voltage to the brush roller, and uniformly charges the surface of the latent image carrier by bringing the brush roller into contact with the surface of the latent image carrier. The outer diameter of the latent image carrier is in the range 16 [mm] or more and 34 [mm] or less, the outer diameter of the brush roller is in the range 6 [mm] or more and 24 [mm] or less, and the outer diameter of the latent image carrier and the outer diameter of the brush roller are set so that the sum of the outer diameters thereof is 40 [mm] or less.
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Gray David M
Labombard Ruth N
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Ricoh & Company, Ltd.
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